[Elphel-support] (no subject)

[Oleg]

Hi,

But,i fall in the trouble of vignetting recently.I find you use the
> method of Function approximation.I look up some papers,the Function is
> f(i,j) = cosh(rx*(x-x0))*cosh(ry*(y-y0)) +c .However,yours is
> f(x,y)=p*(x-x0)^2 +q*(y-y0)^2 + c    ----->>    f(x,y)=AX*x^2 + BX*x +
> AY*y^2 + BY*y + c.
> Could i ask you how to get the Function ,and how to set the initial
> value of AX、AY、BX、BY and C?
>

I haven't dealt with this.
Make test images and use them to estimate these values - look at the
vignetting gradient function and pick several points and solve the system.

Best regards,
Oleg Dzhimiev
Electronics Engineer
phone: +1 801 783 5555 x124
Elphel, Inc.
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